The Robustness of n_s < 0.95 in Racetrack Inflation
arXiv:0712.0535 · doi:10.1088/1475-7516/2008/02/020
Abstract
A spectral index n_s < 0.95 appears to be a generic prediction of racetrack inflation models. Reducing a general racetrack model to a single-field inflation model with a simple potential, we obtain an analytic expression for the spectral index, which explains this result. By considering the limits of validity of the derivation, possible ways to achieve higher values of the spectral index are described, although these require further fine-tuning of the potential.
arXiv comment7 pages, 2 figures
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